llvm-project

72954e17 - [libc++] Adds is_implemented function for new ftm generator.

[libc++] Adds is_implemented function for new ftm generator. At the moment the ftm macro for __cpp_lib_to_chars will have the following values: standard_ftms: { "c++17": "201611L", "c++20": "201611L", "c++23": "201611L", "c++26": "201611L", } implemented_ftms: { "c++17": None, } This is an issue with the test whether the FTM is implemented it does: self.implemented_ftms[ftm][std] == self.standard_ftms[ftm][std] This will fail in C++20 since implemented_ftms[ftm] does not have the key c++20. This adds a new helper function and removes the None entries when a FTM is not implemented.